I just bought a 2.5 gallon tank for two African Dwarf Frogs yesterday. I did exactly as the pet store lady told me to get them properly acclimated. I wake up this morning and the tank is cloudy. I took a sample to the pet store this morning they tell me there is nothing wrong with the water, but the PH level is a little high. They give me API PH lower solution and to take out 20% of the water and replace it with new water. I did that around 10:30am. It's 8pm and the water is less cloudy, but still cloudy. I used Nutrafin Aqua Plus originally to clean the water to get them acclimated. The tank came with a filter system. I cleaned that properly before use along with the stones at the bottom and I don't see why it would still be cloudy. Now the API PH lower solution seems to be creating bubbles at the top of the tank. Not a lot though. There isn't much in the tank right now. Just pet store rocks and 2 hiding places for the frogs.